2 * Sierra VMD Format Demuxer
3 * Copyright (c) 2004 The ffmpeg Project
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Sierra VMD file demuxer
25 * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
26 * for more information on the Sierra VMD file format, visit:
27 * http://www.pcisys.net/~melanson/codecs/
32 #define VMD_HEADER_SIZE 0x0330
33 #define BYTES_PER_FRAME_RECORD 16
38 unsigned int frame_size;
41 unsigned char frame_record[BYTES_PER_FRAME_RECORD];
44 typedef struct VmdDemuxContext {
45 int video_stream_index;
46 int audio_stream_index;
48 unsigned int frame_count;
49 unsigned int frames_per_block;
50 vmd_frame *frame_table;
51 unsigned int current_frame;
55 int64_t audio_sample_counter;
58 unsigned char vmd_header[VMD_HEADER_SIZE];
61 static int vmd_probe(AVProbeData *p)
63 /* check if the first 2 bytes of the file contain the appropriate size
64 * of a VMD header chunk */
65 if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
68 /* only return half certainty since this check is a bit sketchy */
69 return AVPROBE_SCORE_MAX / 2;
72 static int vmd_read_header(AVFormatContext *s,
73 AVFormatParameters *ap)
75 VmdDemuxContext *vmd = s->priv_data;
76 ByteIOContext *pb = s->pb;
77 AVStream *st = NULL, *vst;
78 unsigned int toc_offset;
79 unsigned char *raw_frame_table;
80 int raw_frame_table_size;
81 int64_t current_offset;
83 unsigned int total_frames;
85 int64_t current_video_pts = 0, current_audio_pts = 0;
86 unsigned char chunk[BYTES_PER_FRAME_RECORD];
90 /* fetch the main header, including the 2 header length bytes */
91 url_fseek(pb, 0, SEEK_SET);
92 if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
95 if(vmd->vmd_header[16] == 'i' && vmd->vmd_header[17] == 'v' && vmd->vmd_header[18] == '3')
99 /* start up the decoders */
100 vst = av_new_stream(s, 0);
102 return AVERROR(ENOMEM);
103 av_set_pts_info(vst, 33, 1, 10);
104 vmd->video_stream_index = vst->index;
105 vst->codec->codec_type = CODEC_TYPE_VIDEO;
106 vst->codec->codec_id = vmd->is_indeo3 ? CODEC_ID_INDEO3 : CODEC_ID_VMDVIDEO;
107 vst->codec->codec_tag = 0; /* no fourcc */
108 vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
109 vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
110 if(vmd->is_indeo3 && vst->codec->width > 320){
111 vst->codec->width >>= 1;
112 vst->codec->height >>= 1;
114 vst->codec->extradata_size = VMD_HEADER_SIZE;
115 vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
116 memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
118 /* if sample rate is 0, assume no audio */
119 vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
120 if (vmd->sample_rate) {
121 st = av_new_stream(s, 0);
123 return AVERROR(ENOMEM);
124 vmd->audio_stream_index = st->index;
125 st->codec->codec_type = CODEC_TYPE_AUDIO;
126 st->codec->codec_id = CODEC_ID_VMDAUDIO;
127 st->codec->codec_tag = 0; /* no fourcc */
128 st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
129 st->codec->sample_rate = vmd->sample_rate;
130 st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
131 if (st->codec->block_align & 0x8000) {
132 st->codec->bits_per_coded_sample = 16;
133 st->codec->block_align = -(st->codec->block_align - 0x10000);
135 st->codec->bits_per_coded_sample = 8;
137 st->codec->bit_rate = st->codec->sample_rate *
138 st->codec->bits_per_coded_sample * st->codec->channels;
141 num = st->codec->block_align;
142 den = st->codec->sample_rate * st->codec->channels;
143 av_reduce(&den, &num, den, num, (1UL<<31)-1);
144 av_set_pts_info(vst, 33, num, den);
145 av_set_pts_info(st, 33, num, den);
149 toc_offset = AV_RL32(&vmd->vmd_header[812]);
150 vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
151 vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
152 url_fseek(pb, toc_offset, SEEK_SET);
154 raw_frame_table = NULL;
155 vmd->frame_table = NULL;
156 sound_buffers = AV_RL16(&vmd->vmd_header[808]);
157 raw_frame_table_size = vmd->frame_count * 6;
158 if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame)){
159 av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
162 raw_frame_table = av_malloc(raw_frame_table_size);
163 vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
164 if (!raw_frame_table || !vmd->frame_table) {
165 av_free(raw_frame_table);
166 av_free(vmd->frame_table);
167 return AVERROR(ENOMEM);
169 if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
170 raw_frame_table_size) {
171 av_free(raw_frame_table);
172 av_free(vmd->frame_table);
177 for (i = 0; i < vmd->frame_count; i++) {
179 current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
181 /* handle each entry in index block */
182 for (j = 0; j < vmd->frames_per_block; j++) {
186 get_buffer(pb, chunk, BYTES_PER_FRAME_RECORD);
188 size = AV_RL32(&chunk[2]);
192 case 1: /* Audio Chunk */
194 /* first audio chunk contains several audio buffers */
195 if(current_audio_pts){
196 vmd->frame_table[total_frames].frame_offset = current_offset;
197 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
198 vmd->frame_table[total_frames].frame_size = size;
199 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
200 vmd->frame_table[total_frames].pts = current_audio_pts;
202 current_audio_pts += pts_inc;
210 url_fseek(pb, current_offset, SEEK_SET);
211 flags = get_le32(pb);
213 url_fseek(pb, pos, SEEK_SET);
214 av_log(s, AV_LOG_DEBUG, "Sound mapping = %08X (%i bufs)\n", flags, sound_buffers);
215 for(k = 0; k < sound_buffers - 1; k++){
216 if(flags & 1) { /* silent block */
217 vmd->frame_table[total_frames].frame_size = 0;
219 vmd->frame_table[total_frames].frame_size = st->codec->block_align + (st->codec->block_align & 1);
221 noff += vmd->frame_table[total_frames].frame_size;
222 vmd->frame_table[total_frames].frame_offset = current_offset + noff;
223 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
224 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
225 vmd->frame_table[total_frames].pts = current_audio_pts;
227 current_audio_pts += pts_inc;
232 case 2: /* Video Chunk */
233 vmd->frame_table[total_frames].frame_offset = current_offset;
234 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
235 vmd->frame_table[total_frames].frame_size = size;
236 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
237 vmd->frame_table[total_frames].pts = current_video_pts;
241 current_offset += size;
243 current_video_pts += pts_inc;
246 av_free(raw_frame_table);
248 vmd->current_frame = 0;
249 vmd->frame_count = total_frames;
254 static int vmd_read_packet(AVFormatContext *s,
257 VmdDemuxContext *vmd = s->priv_data;
258 ByteIOContext *pb = s->pb;
262 if (vmd->current_frame >= vmd->frame_count)
265 frame = &vmd->frame_table[vmd->current_frame];
266 /* position the stream (will probably be there already) */
267 url_fseek(pb, frame->frame_offset, SEEK_SET);
269 if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
270 return AVERROR(ENOMEM);
271 pkt->pos= url_ftell(pb);
272 memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
274 ret = get_buffer(pb, pkt->data, frame->frame_size);
276 ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
279 if (ret != frame->frame_size) {
283 pkt->stream_index = frame->stream_index;
284 pkt->pts = frame->pts;
285 av_log(NULL, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
286 (frame->frame_record[0] == 0x02) ? "video" : "audio",
287 frame->frame_size + BYTES_PER_FRAME_RECORD,
290 vmd->current_frame++;
295 static int vmd_read_close(AVFormatContext *s)
297 VmdDemuxContext *vmd = s->priv_data;
299 av_free(vmd->frame_table);
304 AVInputFormat vmd_demuxer = {
306 NULL_IF_CONFIG_SMALL("Sierra VMD format"),
307 sizeof(VmdDemuxContext),